HARQ Response Multiplexing on Uplink Data Channel
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Solution Overview
Problem
In communication systems, particularly those using higher frequency bands like the new radio (NR) system, there is a challenge in efficiently transmitting hybrid automatic repeat request (HARQ) responses due to power limitations and queuing delays, especially when physical resources are not immediately available for new codewords, leading to potential DCI blocking and delayed information bit transmission.
Innovation Solution
The method involves transmitting HARQ responses on an uplink data channel when it overlaps with uplink control channels, using dynamic and semi-persistent scheduling schemes, and configuring the HARQ response codebook to multiplex responses based on the timing and priority of downlink data, allowing for efficient use of radio resources and reducing transmission delays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the terminal transmits HARQ response on uplink control channel, then the HARQ response can be transmitted with dedicated control resources, but transmission delay increases due to power limitations and queuing delays
Solution Approach 1:
The patent merges the transmission of HARQ response from uplink control channel to uplink data channel. When uplink control channel resources are unavailable or would cause delay, the terminal multiplexes HARQ response onto the uplink data channel that is already being transmitted for other purposes, thereby eliminating the need for separate control channel transmission and reducing delay while maintaining reliability
Solution Approach 2:
The uplink data channel is given multi-functionality by allowing it to carry both data traffic and HARQ control information simultaneously. This universal channel can serve multiple purposes: transmitting uplink data, transmitting HARQ responses, and adapting its function based on resource availability and timing requirements
2Adaptability or versatility
If the terminal transmits multiple uplink channels simultaneously, then comprehensive communication functions can be performed, but power limitation is exceeded
Solution Approach 1:
The patent combines multiple uplink transmissions (data and control information) into a single uplink data channel transmission. By multiplexing HARQ response onto the uplink data channel, the terminal transmits both data and control information together in one transmission event, reducing total power consumption while maintaining complete communication functionality
Solution Approach 2:
The transmission strategy is made dynamic by allowing the terminal to adaptively choose whether to use uplink control channel or uplink data channel for HARQ response transmission based on real-time conditions such as resource availability, timing requirements, and power constraints, optimizing the balance between functionality and power usage
3Reliability
If the base station maintains low code rate for high reliability, then transmission reliability improves, but physical resources are insufficient for new codeword mapping causing queuing delay
Solution Approach 1:
The patent enables continuous transmission by allowing HARQ responses to be transmitted on uplink data channels without waiting for separate control channel resources. This eliminates idle time and queuing delays while maintaining the low code rate for reliability, ensuring that the useful action of information transmission continues without interruption
Solution Approach 2:
The terminal prepares and transmits HARQ response information in advance by multiplexing it onto the uplink data channel before the data transmission is complete, ensuring that feedback is available timely for the base station to make scheduling decisions for subsequent transmissions, thereby preventing queuing delays
Data Source
AI summary
Feedback methods for repetitive uplink transmissions in a communication system are disclosed. An operation method of a terminal may comprise receiving DL data #1 from a base station through a DL data channel #1; receiving DL data #2 from the base station through a DL data channel #2; and when each of a UL control channel #1 on which an HARQ response #1 for the DL data #1 is to be transmitted and a UL control channel #2 on which an HARQ response #2 for the DL data #2 is to be transmitted overlaps with a UL data channel assigned by the base station, transmitting the HARQ response #1 and the HARQ response #2 to the base station through the UL data channel. Therefore, the performance of the communication system can be improved.